When even you think it’s dirty enough cause your situation probably different? Mine according 4” filter last year or more unless weather unusually dry. But, I have angel hair filters on the intake which catches the big stuff, I change that every 4 to 6 months. And no it don’t affect air flow cause I measured before and after at ducts outlets. My ducts flow 350 to 580 CFM.
Last edited by Topspinmo; 10-27-2024 at 11:13 AM.
Reason: Too many inches
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